gui-cs.Terminal.Gui/UnitTests/Views/ToplevelTests.cs

using System;
using Terminal.Gui;
using Xunit;
using Xunit.Abstractions;

namespace Terminal.Gui.ViewsTests {
	public class ToplevelTests {
		readonly ITestOutputHelper output;

		public ToplevelTests (ITestOutputHelper output)
		{
			this.output = output;
		}

		[Fact]
		[AutoInitShutdown]
		public void Constructor_Default ()
		{
			var top = new Toplevel ();

			Assert.Equal (Colors.TopLevel, top.ColorScheme);
			Assert.Equal ("Fill(0)", top.Width.ToString ());
			Assert.Equal ("Fill(0)", top.Height.ToString ());
			Assert.False (top.Running);
			Assert.False (top.Modal);
			Assert.Null (top.MenuBar);
			Assert.Null (top.StatusBar);
			Assert.False (top.IsOverlappedContainer);
			Assert.False (top.IsOverlapped);
		}

		[Fact]
		[AutoInitShutdown]
		public void Create_Toplevel ()
		{
			var top = Toplevel.Create ();
			top.BeginInit ();
			top.EndInit ();
			Assert.Equal (new Rect (0, 0, Application.Driver.Cols, Application.Driver.Rows), top.Bounds);
		}

		[Fact]
		[AutoInitShutdown]
		public void Application_Top_GetLocationThatFits_To_Driver_Rows_And_Cols ()
		{
			var iterations = 0;

			Application.Iteration += (s, a) => {
				if (iterations == 0) {
					Assert.False (Application.Top.AutoSize);
					Assert.Equal ("Top1", Application.Top.Text);
					Assert.Equal (0, Application.Top.Frame.X);
					Assert.Equal (0, Application.Top.Frame.Y);
					Assert.Equal (Application.Driver.Cols, Application.Top.Frame.Width);
					Assert.Equal (Application.Driver.Rows, Application.Top.Frame.Height);

					Application.Top.ProcessHotKey (new KeyEvent (Key.CtrlMask | Key.R, new KeyModifiers ()));
				} else if (iterations == 1) {
					Assert.Equal ("Top2", Application.Top.Text);
					Assert.Equal (0, Application.Top.Frame.X);
					Assert.Equal (0, Application.Top.Frame.Y);
					Assert.Equal (Application.Driver.Cols, Application.Top.Frame.Width);
					Assert.Equal (Application.Driver.Rows, Application.Top.Frame.Height);

					Application.Top.ProcessHotKey (new KeyEvent (Key.CtrlMask | Key.C, new KeyModifiers ()));
				} else if (iterations == 3) {
					Assert.Equal ("Top1", Application.Top.Text);
					Assert.Equal (0, Application.Top.Frame.X);
					Assert.Equal (0, Application.Top.Frame.Y);
					Assert.Equal (Application.Driver.Cols, Application.Top.Frame.Width);
					Assert.Equal (Application.Driver.Rows, Application.Top.Frame.Height);

					Application.Top.ProcessHotKey (new KeyEvent (Key.CtrlMask | Key.R, new KeyModifiers ()));
				} else if (iterations == 4) {
					Assert.Equal ("Top2", Application.Top.Text);
					Assert.Equal (0, Application.Top.Frame.X);
					Assert.Equal (0, Application.Top.Frame.Y);
					Assert.Equal (Application.Driver.Cols, Application.Top.Frame.Width);
					Assert.Equal (Application.Driver.Rows, Application.Top.Frame.Height);

					Application.Top.ProcessHotKey (new KeyEvent (Key.CtrlMask | Key.C, new KeyModifiers ()));
				} else if (iterations == 6) {
					Assert.Equal ("Top1", Application.Top.Text);
					Assert.Equal (0, Application.Top.Frame.X);
					Assert.Equal (0, Application.Top.Frame.Y);
					Assert.Equal (Application.Driver.Cols, Application.Top.Frame.Width);
					Assert.Equal (Application.Driver.Rows, Application.Top.Frame.Height);

					Application.Top.ProcessHotKey (new KeyEvent (Key.CtrlMask | Key.Q, new KeyModifiers ()));
				}
				iterations++;
			};

			Application.Run (Top1 ());

			Toplevel Top1 ()
			{
				var top = Application.Top;
				top.Text = "Top1";
				var menu = new MenuBar (new MenuBarItem [] {
					new MenuBarItem ("_Options", new MenuItem [] {
						new MenuItem ("_Run Top2", "", () => Application.Run (Top2 ()), null, null, Key.CtrlMask | Key.R),
						new MenuItem ("_Quit", "", () => Application.RequestStop(), null, null, Key.CtrlMask | Key.Q)
					})
				});
				top.Add (menu);

				var statusBar = new StatusBar (new [] {
					new StatusItem(Key.CtrlMask | Key.R, "~^R~ Run Top2", () => Application.Run (Top2 ())),
					new StatusItem(Application.QuitKey, $"{Application.QuitKey} to Quit", () => Application.RequestStop())
				});
				top.Add (statusBar);

				var t1 = new Toplevel ();
				top.Add (t1);

				return top;
			}

			Toplevel Top2 ()
			{
				var top = new Toplevel (Application.Top.Frame);
				top.Text = "Top2";
				var win = new Window () { Width = Dim.Fill (), Height = Dim.Fill () };
				var menu = new MenuBar (new MenuBarItem [] {
					new MenuBarItem ("_Stage", new MenuItem [] {
						new MenuItem ("_Close", "", () => Application.RequestStop(), null, null, Key.CtrlMask | Key.C)
					})
				});
				top.Add (menu);

				var statusBar = new StatusBar (new [] {
					new StatusItem(Key.CtrlMask | Key.C, "~^C~ Close", () => Application.RequestStop()),
				});
				top.Add (statusBar);

				win.Add (new ListView () {
					X = 0,
					Y = 0,
					Width = Dim.Fill (),
					Height = Dim.Fill ()
				});
				top.Add (win);

				return top;
			}
		}

		[Fact]
		[AutoInitShutdown]
		public void Internal_Tests ()
		{
			var top = new Toplevel ();

			var eventInvoked = "";

			top.ChildUnloaded += (s, e) => eventInvoked = "ChildUnloaded";
			top.OnChildUnloaded (top);
			Assert.Equal ("ChildUnloaded", eventInvoked);
			top.ChildLoaded += (s, e) => eventInvoked = "ChildLoaded";
			top.OnChildLoaded (top);
			Assert.Equal ("ChildLoaded", eventInvoked);
			top.Closed += (s, e) => eventInvoked = "Closed";
			top.OnClosed (top);
			Assert.Equal ("Closed", eventInvoked);
			top.Closing += (s, e) => eventInvoked = "Closing";
			top.OnClosing (new ToplevelClosingEventArgs (top));
			Assert.Equal ("Closing", eventInvoked);
			top.AllChildClosed += (s, e) => eventInvoked = "AllChildClosed";
			top.OnAllChildClosed ();
			Assert.Equal ("AllChildClosed", eventInvoked);
			top.ChildClosed += (s, e) => eventInvoked = "ChildClosed";
			top.OnChildClosed (top);
			Assert.Equal ("ChildClosed", eventInvoked);
			top.Deactivate += (s, e) => eventInvoked = "Deactivate";
			top.OnDeactivate (top);
			Assert.Equal ("Deactivate", eventInvoked);
			top.Activate += (s, e) => eventInvoked = "Activate";
			top.OnActivate (top);
			Assert.Equal ("Activate", eventInvoked);
			top.Loaded += (s, e) => eventInvoked = "Loaded";
			top.OnLoaded ();
			Assert.Equal ("Loaded", eventInvoked);
			top.Ready += (s, e) => eventInvoked = "Ready";
			top.OnReady ();
			Assert.Equal ("Ready", eventInvoked);
			top.Unloaded += (s, e) => eventInvoked = "Unloaded";
			top.OnUnloaded ();
			Assert.Equal ("Unloaded", eventInvoked);

			top.AddMenuStatusBar (new MenuBar ());
			Assert.NotNull (top.MenuBar);
			top.AddMenuStatusBar (new StatusBar ());
			Assert.NotNull (top.StatusBar);
			top.RemoveMenuStatusBar (top.MenuBar);
			Assert.Null (top.MenuBar);
			top.RemoveMenuStatusBar (top.StatusBar);
			Assert.Null (top.StatusBar);

			Application.Begin (top);
			Assert.Equal (top, Application.Top);

			// Application.Top without menu and status bar.
			var supView = top.GetLocationThatFits (top, 2, 2, out int nx, out int ny, out MenuBar mb, out StatusBar sb);
			Assert.Equal (Application.Top, supView);
			Assert.Equal (0, nx);
			Assert.Equal (0, ny);
			Assert.Null (mb);
			Assert.Null (sb);

			top.AddMenuStatusBar (new MenuBar ());
			Assert.NotNull (top.MenuBar);

			// Application.Top with a menu and without status bar.
			top.GetLocationThatFits (top, 2, 2, out nx, out ny, out mb, out sb);
			Assert.Equal (0, nx);
			Assert.Equal (1, ny);
			Assert.NotNull (mb);
			Assert.Null (sb);

			top.AddMenuStatusBar (new StatusBar ());
			Assert.NotNull (top.StatusBar);

			// Application.Top with a menu and status bar.
			top.GetLocationThatFits (top, 2, 2, out nx, out ny, out mb, out sb);
			Assert.Equal (0, nx);
			// The available height is lower than the Application.Top height minus
			// the menu bar and status bar, then the top can go beyond the bottom
			Assert.Equal (2, ny);
			Assert.NotNull (mb);
			Assert.NotNull (sb);

			top.RemoveMenuStatusBar (top.MenuBar);
			Assert.Null (top.MenuBar);

			// Application.Top without a menu and with a status bar.
			top.GetLocationThatFits (top, 2, 2, out nx, out ny, out mb, out sb);
			Assert.Equal (0, nx);
			// The available height is lower than the Application.Top height minus
			// the status bar, then the top can go beyond the bottom
			Assert.Equal (2, ny);
			Assert.Null (mb);
			Assert.NotNull (sb);

			top.RemoveMenuStatusBar (top.StatusBar);
			Assert.Null (top.StatusBar);
			Assert.Null (top.MenuBar);

			var win = new Window () { Width = Dim.Fill (), Height = Dim.Fill () };
			top.Add (win);
			top.LayoutSubviews ();

			// The SuperView is always the same regardless of the caller.
			supView = top.GetLocationThatFits (win, 0, 0, out nx, out ny, out mb, out sb);
			Assert.Equal (Application.Top, supView);
			supView = win.GetLocationThatFits (win, 0, 0, out nx, out ny, out mb, out sb);
			Assert.Equal (Application.Top, supView);

			// Application.Top without menu and status bar.
			top.GetLocationThatFits (win, 0, 0, out nx, out ny, out mb, out sb);
			Assert.Equal (0, nx);
			Assert.Equal (0, ny);
			Assert.Null (mb);
			Assert.Null (sb);

			top.AddMenuStatusBar (new MenuBar ());
			Assert.NotNull (top.MenuBar);

			// Application.Top with a menu and without status bar.
			top.GetLocationThatFits (win, 2, 2, out nx, out ny, out mb, out sb);
			Assert.Equal (0, nx);
			Assert.Equal (1, ny);
			Assert.NotNull (mb);
			Assert.Null (sb);

			top.AddMenuStatusBar (new StatusBar ());
			Assert.NotNull (top.StatusBar);

			// Application.Top with a menu and status bar.
			top.GetLocationThatFits (win, 30, 20, out nx, out ny, out mb, out sb);
			Assert.Equal (0, nx);
			// The available height is lower than the Application.Top height minus
			// the menu bar and status bar, then the top can go beyond the bottom
			Assert.Equal (20, ny);
			Assert.NotNull (mb);
			Assert.NotNull (sb);

			top.RemoveMenuStatusBar (top.MenuBar);
			top.RemoveMenuStatusBar (top.StatusBar);
			Assert.Null (top.StatusBar);
			Assert.Null (top.MenuBar);

			top.Remove (win);

			win = new Window () { Width = 60, Height = 15 };
			top.Add (win);

			// Application.Top without menu and status bar.
			top.GetLocationThatFits (win, 0, 0, out nx, out ny, out mb, out sb);
			Assert.Equal (0, nx);
			Assert.Equal (0, ny);
			Assert.Null (mb);
			Assert.Null (sb);

			top.AddMenuStatusBar (new MenuBar ());
			Assert.NotNull (top.MenuBar);

			// Application.Top with a menu and without status bar.
			top.GetLocationThatFits (win, 2, 2, out nx, out ny, out mb, out sb);
			Assert.Equal (2, nx);
			Assert.Equal (2, ny);
			Assert.NotNull (mb);
			Assert.Null (sb);

			top.AddMenuStatusBar (new StatusBar ());
			Assert.NotNull (top.StatusBar);

			// Application.Top with a menu and status bar.
			top.GetLocationThatFits (win, 30, 20, out nx, out ny, out mb, out sb);
			Assert.Equal (20, nx); // 20+60=80
			Assert.Equal (9, ny); // 9+15+1(mb)=25
			Assert.NotNull (mb);
			Assert.NotNull (sb);

			top.PositionToplevels ();
			Assert.Equal (new Rect (0, 1, 60, 15), win.Frame);

			Assert.Null (Toplevel._dragPosition);
			win.MouseEvent (new MouseEvent () { X = 6, Y = 0, Flags = MouseFlags.Button1Pressed });
			Assert.Equal (new Point (6, 0), Toplevel._dragPosition);
			win.MouseEvent (new MouseEvent () { X = 6, Y = 0, Flags = MouseFlags.Button1Released });
			Assert.Null (Toplevel._dragPosition);
			win.CanFocus = false;
			win.MouseEvent (new MouseEvent () { X = 6, Y = 0, Flags = MouseFlags.Button1Pressed });
			Assert.Null (Toplevel._dragPosition);
		}

		[Fact]
		[AutoInitShutdown]
		public void KeyBindings_Command ()
		{
			var isRunning = false;

			var win1 = new Window () { Id = "win1", Width = Dim.Percent (50f), Height = Dim.Fill () };
			var lblTf1W1 = new Label ("Enter text in TextField on Win1:") { Id = "lblTf1W1" };
			var tf1W1 = new TextField ("Text1 on Win1") { Id = "tf1W1", X = Pos.Right (lblTf1W1) + 1, Width = Dim.Fill () };
			var lblTvW1 = new Label ("Enter text in TextView on Win1:") { Id = "lblTvW1", Y = Pos.Bottom (lblTf1W1) + 1 };
			var tvW1 = new TextView () { Id = "tvW1", X = Pos.Left (tf1W1), Width = Dim.Fill (), Height = 2, Text = "First line Win1\nSecond line Win1" };
			var lblTf2W1 = new Label ("Enter text in TextField on Win1:") { Id = "lblTf2W1", Y = Pos.Bottom (lblTvW1) + 1 };
			var tf2W1 = new TextField ("Text2 on Win1") { Id = "tf2W1", X = Pos.Left (tf1W1), Width = Dim.Fill () };
			win1.Add (lblTf1W1, tf1W1, lblTvW1, tvW1, lblTf2W1, tf2W1);

			var win2 = new Window () { Id = "win2", X = Pos.Right (win1) + 1, Width = Dim.Percent (50f), Height = Dim.Fill () };
			var lblTf1W2 = new Label ("Enter text in TextField on Win2:") { Id = "lblTf1W2" };
			var tf1W2 = new TextField ("Text1 on Win2") { Id = "tf1W2", X = Pos.Right (lblTf1W2) + 1, Width = Dim.Fill () };
			var lblTvW2 = new Label ("Enter text in TextView on Win2:") { Id = "lblTvW2", Y = Pos.Bottom (lblTf1W2) + 1 };
			var tvW2 = new TextView () { Id = "tvW2", X = Pos.Left (tf1W2), Width = Dim.Fill (), Height = 2, Text = "First line Win1\nSecond line Win2" };
			var lblTf2W2 = new Label ("Enter text in TextField on Win2:") { Id = "lblTf2W2", Y = Pos.Bottom (lblTvW2) + 1 };
			var tf2W2 = new TextField ("Text2 on Win2") { Id = "tf2W2", X = Pos.Left (tf1W2), Width = Dim.Fill () };
			win2.Add (lblTf1W2, tf1W2, lblTvW2, tvW2, lblTf2W2, tf2W2);

			var top = Application.Top;
			top.Add (win1, win2);
			top.Loaded += (s, e) => isRunning = true;
			top.Closing += (s, e) => isRunning = false;
			Application.Begin (top);
			top.Running = true;

			Assert.Equal (new Rect (0, 0, 40, 25), win1.Frame);
			Assert.Equal (new Rect (41, 0, 40, 25), win2.Frame);
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tf1W1, top.MostFocused);

			Assert.True (isRunning);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Application.QuitKey, new KeyModifiers ())));
			Assert.False (isRunning);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.Z | Key.CtrlMask, new KeyModifiers ())));
			Assert.False (top.Focused.ProcessKey (new KeyEvent (Key.F5, new KeyModifiers ())));

			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.Tab, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tvW1, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.Tab, new KeyModifiers ())));
			Assert.Equal ($"\tFirst line Win1{Environment.NewLine}Second line Win1", tvW1.Text);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.BackTab | Key.ShiftMask, new KeyModifiers ())));
			Assert.Equal ($"First line Win1{Environment.NewLine}Second line Win1", tvW1.Text);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.Tab | Key.CtrlMask, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tf2W1, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.Tab, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tf1W1, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.CursorRight, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tf1W1, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.CursorDown, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tvW1, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.I | Key.CtrlMask, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tf2W1, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.BackTab | Key.ShiftMask, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tvW1, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.CursorLeft, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tf1W1, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.CursorUp, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tf2W1, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.Tab | Key.CtrlMask, new KeyModifiers ())));
			Assert.Equal (win2, top.Focused);
			Assert.Equal (tf1W2, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.Tab | Key.CtrlMask | Key.ShiftMask, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tf2W1, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Application.AlternateForwardKey, new KeyModifiers ())));
			Assert.Equal (win2, top.Focused);
			Assert.Equal (tf1W2, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Application.AlternateBackwardKey, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tf2W1, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.CursorUp, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tvW1, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.B | Key.CtrlMask, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tf1W1, top.MostFocused);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.CursorDown, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tvW1, top.MostFocused);
			Assert.Equal (new Point (0, 0), tvW1.CursorPosition);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.End | Key.CtrlMask, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tvW1, top.MostFocused);
			Assert.Equal (new Point (16, 1), tvW1.CursorPosition);
			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.F | Key.CtrlMask, new KeyModifiers ())));
			Assert.Equal (win1, top.Focused);
			Assert.Equal (tf2W1, top.MostFocused);

			Assert.True (top.Focused.ProcessKey (new KeyEvent (Key.L | Key.CtrlMask, new KeyModifiers ())));
		}

		[Fact]
		[AutoInitShutdown]
		public void KeyBindings_Command_With_OverlappedTop ()
		{
			var top = Application.Top;
			Assert.Null (Application.OverlappedTop);
			top.IsOverlappedContainer = true;
			Application.Begin (top);
			Assert.Equal (Application.Top, Application.OverlappedTop);

			var isRunning = true;

			var win1 = new Window () { Id = "win1", Width = Dim.Percent (50f), Height = Dim.Fill () };
			var lblTf1W1 = new Label ("Enter text in TextField on Win1:");
			var tf1W1 = new TextField ("Text1 on Win1") { X = Pos.Right (lblTf1W1) + 1, Width = Dim.Fill () };
			var lblTvW1 = new Label ("Enter text in TextView on Win1:") { Y = Pos.Bottom (lblTf1W1) + 1 };
			var tvW1 = new TextView () { X = Pos.Left (tf1W1), Width = Dim.Fill (), Height = 2, Text = "First line Win1\nSecond line Win1" };
			var lblTf2W1 = new Label ("Enter text in TextField on Win1:") { Y = Pos.Bottom (lblTvW1) + 1 };
			var tf2W1 = new TextField ("Text2 on Win1") { X = Pos.Left (tf1W1), Width = Dim.Fill () };
			win1.Add (lblTf1W1, tf1W1, lblTvW1, tvW1, lblTf2W1, tf2W1);

			var win2 = new Window () { Id = "win2", Width = Dim.Percent (50f), Height = Dim.Fill () };
			var lblTf1W2 = new Label ("Enter text in TextField on Win2:");
			var tf1W2 = new TextField ("Text1 on Win2") { X = Pos.Right (lblTf1W2) + 1, Width = Dim.Fill () };
			var lblTvW2 = new Label ("Enter text in TextView on Win2:") { Y = Pos.Bottom (lblTf1W2) + 1 };
			var tvW2 = new TextView () { X = Pos.Left (tf1W2), Width = Dim.Fill (), Height = 2, Text = "First line Win1\nSecond line Win2" };
			var lblTf2W2 = new Label ("Enter text in TextField on Win2:") { Y = Pos.Bottom (lblTvW2) + 1 };
			var tf2W2 = new TextField ("Text2 on Win2") { X = Pos.Left (tf1W2), Width = Dim.Fill () };
			win2.Add (lblTf1W2, tf1W2, lblTvW2, tvW2, lblTf2W2, tf2W2);

			win1.Closing += (s, e) => isRunning = false;
			Assert.Null (top.Focused);
			Assert.Equal (top, Application.Current);
			Assert.True (top.IsCurrentTop);
			Assert.Equal (top, Application.OverlappedTop);
			Application.Begin (win1);
			Assert.Equal (new Rect (0, 0, 40, 25), win1.Frame);
			Assert.NotEqual (top, Application.Current);
			Assert.False (top.IsCurrentTop);
			Assert.Equal (win1, Application.Current);
			Assert.True (win1.IsCurrentTop);
			Assert.True (win1.IsOverlapped);
			Assert.Null (top.Focused);
			Assert.Null (top.MostFocused);
			Assert.Equal (tf1W1, win1.MostFocused);
			Assert.True (win1.IsOverlapped);
			Assert.Single (Application.OverlappedChildren);
			Application.Begin (win2);
			Assert.Equal (new Rect (0, 0, 40, 25), win2.Frame);
			Assert.NotEqual (top, Application.Current);
			Assert.False (top.IsCurrentTop);
			Assert.Equal (win2, Application.Current);
			Assert.True (win2.IsCurrentTop);
			Assert.True (win2.IsOverlapped);
			Assert.Null (top.Focused);
			Assert.Null (top.MostFocused);
			Assert.Equal (tf1W2, win2.MostFocused);
			Assert.Equal (2, Application.OverlappedChildren.Count);

			Application.MoveToOverlappedChild (win1);
			Assert.Equal (win1, Application.Current);
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			win1.Running = true;
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Application.QuitKey, new KeyModifiers ())));
			Assert.False (isRunning);
			Assert.False (win1.Running);
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.Z | Key.CtrlMask, new KeyModifiers ())));
			Assert.False (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.F5, new KeyModifiers ())));

			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.Tab, new KeyModifiers ())));
			Assert.True (win1.IsCurrentTop);
			Assert.Equal (tvW1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.Tab, new KeyModifiers ())));
			Assert.Equal ($"\tFirst line Win1{Environment.NewLine}Second line Win1", tvW1.Text);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.BackTab | Key.ShiftMask, new KeyModifiers ())));
			Assert.Equal ($"First line Win1{Environment.NewLine}Second line Win1", tvW1.Text);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.Tab | Key.CtrlMask, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tf2W1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.Tab, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tf1W1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.CursorRight, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tf1W1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.CursorDown, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tvW1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.I | Key.CtrlMask, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tf2W1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.BackTab | Key.ShiftMask, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tvW1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.CursorLeft, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tf1W1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.CursorUp, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tf2W1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.Tab, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tf1W1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.Tab | Key.CtrlMask, new KeyModifiers ())));
			Assert.Equal (win2, Application.OverlappedChildren [0]);
			Assert.Equal (tf1W2, win2.MostFocused);
			tf2W2.SetFocus ();
			Assert.True (tf2W2.HasFocus);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.Tab | Key.CtrlMask | Key.ShiftMask, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tf1W1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Application.AlternateForwardKey, new KeyModifiers ())));
			Assert.Equal (win2, Application.OverlappedChildren [0]);
			Assert.Equal (tf2W2, win2.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Application.AlternateBackwardKey, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tf1W1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.CursorDown, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tvW1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.B | Key.CtrlMask, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tf1W1, win1.MostFocused);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.CursorDown, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tvW1, win1.MostFocused);
			Assert.Equal (new Point (0, 0), tvW1.CursorPosition);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.End | Key.CtrlMask, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tvW1, win1.MostFocused);
			Assert.Equal (new Point (16, 1), tvW1.CursorPosition);
			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.F | Key.CtrlMask, new KeyModifiers ())));
			Assert.Equal (win1, Application.OverlappedChildren [0]);
			Assert.Equal (tf2W1, win1.MostFocused);

			Assert.True (Application.OverlappedChildren [0].ProcessKey (new KeyEvent (Key.L | Key.CtrlMask, new KeyModifiers ())));
		}

		[Fact]
		public void Added_Event_Should_Not_Be_Used_To_Initialize_Toplevel_Events ()
		{
			Key alternateForwardKey = default;
			Key alternateBackwardKey = default;
			Key quitKey = default;
			var wasAdded = false;

			var view = new View ();
			view.Added += View_Added;

			void View_Added (object sender, SuperViewChangedEventArgs e)
			{
				Assert.Throws<NullReferenceException> (() => Application.Top.AlternateForwardKeyChanged += (s, e) => alternateForwardKey = e.OldKey);
				Assert.Throws<NullReferenceException> (() => Application.Top.AlternateBackwardKeyChanged += (s, e) => alternateBackwardKey = e.OldKey);
				Assert.Throws<NullReferenceException> (() => Application.Top.QuitKeyChanged += (s, e) => quitKey = e.OldKey);
				Assert.False (wasAdded);
				wasAdded = true;
				view.Added -= View_Added;
			}

			var win = new Window ();
			win.Add (view);
			Application.Init (new FakeDriver ());
			var top = Application.Top;
			top.Add (win);

			Assert.True (wasAdded);

			Application.Shutdown ();
		}

		[Fact]
		[AutoInitShutdown]
		public void AlternateForwardKeyChanged_AlternateBackwardKeyChanged_QuitKeyChanged_Events ()
		{
			Key alternateForwardKey = default;
			Key alternateBackwardKey = default;
			Key quitKey = default;

			var view = new View ();
			view.Initialized += View_Initialized;

			void View_Initialized (object sender, EventArgs e)
			{
				Application.Top.AlternateForwardKeyChanged += (s, e) => alternateForwardKey = e.OldKey;
				Application.Top.AlternateBackwardKeyChanged += (s, e) => alternateBackwardKey = e.OldKey;
				Application.Top.QuitKeyChanged += (s, e) => quitKey = e.OldKey;
			}

			var win = new Window ();
			win.Add (view);
			var top = Application.Top;
			top.Add (win);
			Application.Begin (top);

			Assert.Equal (Key.Null, alternateForwardKey);
			Assert.Equal (Key.Null, alternateBackwardKey);
			Assert.Equal (Key.Null, quitKey);

			Assert.Equal (Key.PageDown | Key.CtrlMask, Application.AlternateForwardKey);
			Assert.Equal (Key.PageUp | Key.CtrlMask, Application.AlternateBackwardKey);
			Assert.Equal (Key.Q | Key.CtrlMask, Application.QuitKey);

			Application.AlternateForwardKey = Key.A;
			Application.AlternateBackwardKey = Key.B;
			Application.QuitKey = Key.C;

			Assert.Equal (Key.PageDown | Key.CtrlMask, alternateForwardKey);
			Assert.Equal (Key.PageUp | Key.CtrlMask, alternateBackwardKey);
			Assert.Equal (Key.Q | Key.CtrlMask, quitKey);

			Assert.Equal (Key.A, Application.AlternateForwardKey);
			Assert.Equal (Key.B, Application.AlternateBackwardKey);
			Assert.Equal (Key.C, Application.QuitKey);

			// Replacing the defaults keys to avoid errors on others unit tests that are using it.
			Application.AlternateForwardKey = Key.PageDown | Key.CtrlMask;
			Application.AlternateBackwardKey = Key.PageUp | Key.CtrlMask;
			Application.QuitKey = Key.Q | Key.CtrlMask;

			Assert.Equal (Key.PageDown | Key.CtrlMask, Application.AlternateForwardKey);
			Assert.Equal (Key.PageUp | Key.CtrlMask, Application.AlternateBackwardKey);
			Assert.Equal (Key.Q | Key.CtrlMask, Application.QuitKey);
		}

		[Fact, AutoInitShutdown]
		public void Mouse_Drag_On_Top_With_Superview_Null ()
		{
			var win = new Window ();
			var top = Application.Top;
			top.Add (win);
			var iterations = -1;

			Application.Iteration += (s, a) => {
				iterations++;
				if (iterations == 0) {
					((FakeDriver)Application.Driver).SetBufferSize (40, 15);
					MessageBox.Query ("", "Hello Word", "Ok");

				} else if (iterations == 1) {
					TestHelpers.AssertDriverContentsWithFrameAre (@$"
┌──────────────────────────────────────┐
│                                      │
│                                      │
│                                      │
│                                      │
│       ┌──────────────────────┐       │
│       │      Hello Word      │       │
│       │                      │       │
│       │       {CM.Glyphs.LeftBracket}{CM.Glyphs.LeftDefaultIndicator} Ok {CM.Glyphs.RightDefaultIndicator}{CM.Glyphs.RightBracket}       │       │
│       └──────────────────────┘       │
│                                      │
│                                      │
│                                      │
│                                      │
└──────────────────────────────────────┘
", output);
				} else if (iterations == 2) {
					Assert.Null (Application.MouseGrabView);
					// Grab the mouse
					Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
						X = 8,
						Y = 5,
						Flags = MouseFlags.Button1Pressed
					}));

					Assert.Equal (Application.Current, Application.MouseGrabView);
					Assert.Equal (new Rect (8, 5, 24, 5), Application.MouseGrabView.Frame);

				} else if (iterations == 3) {
					Assert.Equal (Application.Current, Application.MouseGrabView);
					// Drag to left
					Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
						X = 7,
						Y = 5,
						Flags = MouseFlags.Button1Pressed | MouseFlags.ReportMousePosition
					}));

					Assert.Equal (Application.Current, Application.MouseGrabView);
					Assert.Equal (new Rect (7, 5, 24, 5), Application.MouseGrabView.Frame);

				} else if (iterations == 4) {
					Assert.Equal (Application.Current, Application.MouseGrabView);

					TestHelpers.AssertDriverContentsWithFrameAre (@$"
┌──────────────────────────────────────┐
│                                      │
│                                      │
│                                      │
│                                      │
│      ┌──────────────────────┐        │
│      │      Hello Word      │        │
│      │                      │        │
│      │       {CM.Glyphs.LeftBracket}{CM.Glyphs.LeftDefaultIndicator} Ok {CM.Glyphs.RightDefaultIndicator}{CM.Glyphs.RightBracket}       │        │
│      └──────────────────────┘        │
│                                      │
│                                      │
│                                      │
│                                      │
└──────────────────────────────────────┘", output);

					Assert.Equal (Application.Current, Application.MouseGrabView);
				} else if (iterations == 5) {
					Assert.Equal (Application.Current, Application.MouseGrabView);
					// Drag up
					Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
						X = 7,
						Y = 4,
						Flags = MouseFlags.Button1Pressed | MouseFlags.ReportMousePosition
					}));

					Assert.Equal (Application.Current, Application.MouseGrabView);
					Assert.Equal (new Rect (7, 4, 24, 5), Application.MouseGrabView.Frame);

				} else if (iterations == 6) {
					Assert.Equal (Application.Current, Application.MouseGrabView);

					TestHelpers.AssertDriverContentsWithFrameAre (@$"
┌──────────────────────────────────────┐
│                                      │
│                                      │
│                                      │
│      ┌──────────────────────┐        │
│      │      Hello Word      │        │
│      │                      │        │
│      │       {CM.Glyphs.LeftBracket}{CM.Glyphs.LeftDefaultIndicator} Ok {CM.Glyphs.RightDefaultIndicator}{CM.Glyphs.RightBracket}       │        │
│      └──────────────────────┘        │
│                                      │
│                                      │
│                                      │
│                                      │
│                                      │
└──────────────────────────────────────┘", output);

					Assert.Equal (Application.Current, Application.MouseGrabView);
					Assert.Equal (new Rect (7, 4, 24, 5), Application.MouseGrabView.Frame);

				} else if (iterations == 7) {
					Assert.Equal (Application.Current, Application.MouseGrabView);
					// Ungrab the mouse
					Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
						X = 7,
						Y = 4,
						Flags = MouseFlags.Button1Released
					}));

					Assert.Null (Application.MouseGrabView);

				} else if (iterations == 8) Application.RequestStop ();
				else if (iterations == 9) Application.RequestStop ();
			};

			Application.Run ();
		}

		[Fact, AutoInitShutdown]
		public void Mouse_Drag_On_Top_With_Superview_Not_Null ()
		{
			var win = new Window () {
				X = 3,
				Y = 2,
				Width = 10,
				Height = 5
			};
			var top = Application.Top;
			top.Add (win);

			var iterations = -1;

			int movex = 0;
			int movey = 0;

			var location = new Rect (win.Frame.X, win.Frame.Y, 7, 3);

			Application.Iteration += (s, a) => {
				iterations++;
				if (iterations == 0) {
					((FakeDriver)Application.Driver).SetBufferSize (30, 10);
				} else if (iterations == 1) {
					location = win.Frame;

					Assert.Null (Application.MouseGrabView);
					// Grab the mouse
					Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
						X = win.Frame.X,
						Y = win.Frame.Y,
						Flags = MouseFlags.Button1Pressed
					}));

					Assert.Equal (win, Application.MouseGrabView);
					Assert.Equal (location, Application.MouseGrabView.Frame);
				} else if (iterations == 2) {
					Assert.Equal (win, Application.MouseGrabView);
					// Drag to left
					movex = 1;
					movey = 0;
					Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
						X = win.Frame.X + movex,
						Y = win.Frame.Y + movey,
						Flags = MouseFlags.Button1Pressed | MouseFlags.ReportMousePosition
					}));

					Assert.Equal (win, Application.MouseGrabView);

				} else if (iterations == 3) {
					// we should have moved +1, +0
					Assert.Equal (win, Application.MouseGrabView);
					Assert.Equal (win, Application.MouseGrabView);
					location.Offset (movex, movey);
					Assert.Equal (location, Application.MouseGrabView.Frame);

				} else if (iterations == 4) {
					Assert.Equal (win, Application.MouseGrabView);
					// Drag up
					movex = 0;
					movey = -1;
					Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
						X = win.Frame.X + movex,
						Y = win.Frame.Y + movey,
						Flags = MouseFlags.Button1Pressed | MouseFlags.ReportMousePosition
					}));

					Assert.Equal (win, Application.MouseGrabView);

				} else if (iterations == 5) {
					// we should have moved +0, -1
					Assert.Equal (win, Application.MouseGrabView);
					location.Offset (movex, movey);
					Assert.Equal (location, Application.MouseGrabView.Frame);

				} else if (iterations == 6) {
					Assert.Equal (win, Application.MouseGrabView);
					// Ungrab the mouse
					movex = 0;
					movey = 0;
					Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
						X = win.Frame.X + movex,
						Y = win.Frame.Y + movey,
						Flags = MouseFlags.Button1Released
					}));

					Assert.Null (Application.MouseGrabView);
				} else if (iterations == 7) {
					Application.RequestStop ();
				}
			};

			Application.Run ();
		}

		[Fact, AutoInitShutdown]
		public void GetLocationThatFits_With_Border_Null_Not_Throws ()
		{
			var top = new Toplevel ();
			Application.Begin (top);

			var exception = Record.Exception (() => ((FakeDriver)Application.Driver).SetBufferSize (0, 10));
			Assert.Null (exception);

			exception = Record.Exception (() => ((FakeDriver)Application.Driver).SetBufferSize (10, 0));
			Assert.Null (exception);
		}

		[Fact, AutoInitShutdown]
		public void OnEnter_OnLeave_Triggered_On_Application_Begin_End ()
		{
			var isEnter = false;
			var isLeave = false;
			var v = new View ();
			v.Enter += (s, _) => isEnter = true;
			v.Leave += (s, _) => isLeave = true;
			var top = Application.Top;
			top.Add (v);

			Assert.False (v.CanFocus);
			var exception = Record.Exception (() => top.OnEnter (top));
			Assert.Null (exception);
			exception = Record.Exception (() => top.OnLeave (top));
			Assert.Null (exception);

			v.CanFocus = true;
			Application.Begin (top);

			Assert.True (isEnter);
			Assert.False (isLeave);

			isEnter = false;
			var d = new Dialog ();
			var rs = Application.Begin (d);

			Assert.False (isEnter);
			Assert.True (isLeave);

			isLeave = false;
			Application.End (rs);

			Assert.True (isEnter);
			Assert.False (isLeave);  // Leave event cannot be trigger because it v.Enter was performed and v is focused
			Assert.True (v.HasFocus);
		}

		[Fact, AutoInitShutdown]
		public void OnEnter_OnLeave_Triggered_On_Application_Begin_End_With_More_Toplevels ()
		{
			var iterations = 0;
			var steps = new int [5];
			var isEnterTop = false;
			var isLeaveTop = false;
			var vt = new View ();
			var top = Application.Top;
			var diag = new Dialog ();

			vt.Enter += (s, e) => {
				iterations++;
				isEnterTop = true;
				if (iterations == 1) {
					steps [0] = iterations;
					Assert.Null (e.View);
				} else {
					steps [4] = iterations;
					Assert.Equal (diag, e.View);
				}
			};
			vt.Leave += (s, e) => {
				iterations++;
				steps [1] = iterations;
				isLeaveTop = true;
				Assert.Equal (diag, e.View);
			};
			top.Add (vt);

			Assert.False (vt.CanFocus);
			var exception = Record.Exception (() => top.OnEnter (top));
			Assert.Null (exception);
			exception = Record.Exception (() => top.OnLeave (top));
			Assert.Null (exception);

			vt.CanFocus = true;
			Application.Begin (top);

			Assert.True (isEnterTop);
			Assert.False (isLeaveTop);

			isEnterTop = false;
			var isEnterDiag = false;
			var isLeaveDiag = false;
			var vd = new View ();
			vd.Enter += (s, e) => {
				iterations++;
				steps [2] = iterations;
				isEnterDiag = true;
				Assert.Null (e.View);
			};
			vd.Leave += (s, e) => {
				iterations++;
				steps [3] = iterations;
				isLeaveDiag = true;
				Assert.Equal (top, e.View);
			};
			diag.Add (vd);

			Assert.False (vd.CanFocus);
			exception = Record.Exception (() => diag.OnEnter (diag));
			Assert.Null (exception);
			exception = Record.Exception (() => diag.OnLeave (diag));
			Assert.Null (exception);

			vd.CanFocus = true;
			var rs = Application.Begin (diag);

			Assert.True (isEnterDiag);
			Assert.False (isLeaveDiag);
			Assert.False (isEnterTop);
			Assert.True (isLeaveTop);

			isEnterDiag = false;
			isLeaveTop = false;
			Application.End (rs);

			Assert.False (isEnterDiag);
			Assert.True (isLeaveDiag);
			Assert.True (isEnterTop);
			Assert.False (isLeaveTop);  // Leave event cannot be trigger because it v.Enter was performed and v is focused
			Assert.True (vt.HasFocus);
			Assert.Equal (1, steps [0]);
			Assert.Equal (2, steps [1]);
			Assert.Equal (3, steps [2]);
			Assert.Equal (4, steps [3]);
			Assert.Equal (5, steps [^1]);
		}

		[Fact, AutoInitShutdown]
		public void PositionCursor_SetCursorVisibility_To_Invisible_If_Focused_Is_Null ()
		{
			var tf = new TextField ("test") { Width = 5 };
			var view = new View () { Width = 10, Height = 10 };
			view.Add (tf);
			Application.Top.Add (view);
			Application.Begin (Application.Top);

			Assert.True (tf.HasFocus);
			Application.Driver.GetCursorVisibility (out CursorVisibility cursor);
			Assert.Equal (CursorVisibility.Default, cursor);

			view.Enabled = false;
			Assert.False (tf.HasFocus);
			Application.Refresh ();
			Application.Driver.GetCursorVisibility (out cursor);
			Assert.Equal (CursorVisibility.Invisible, cursor);
		}

		[Fact, AutoInitShutdown]
		public void IsLoaded_Application_Begin ()
		{
			var top = Application.Top;
			Assert.False (top.IsLoaded);

			Application.Begin (top);
			Assert.True (top.IsLoaded);
		}

		[Fact, AutoInitShutdown]
		public void IsLoaded_With_Sub_Toplevel_Application_Begin_NeedDisplay ()
		{
			var top = Application.Top;
			var subTop = new Toplevel ();
			var view = new View (new Rect (0, 0, 20, 10));
			subTop.Add (view);
			top.Add (subTop);

			Assert.False (top.IsLoaded);
			Assert.False (subTop.IsLoaded);
			Assert.Equal (new Rect (0, 0, 20, 10), view.Frame);

			view.LayoutStarted += view_LayoutStarted;

			void view_LayoutStarted (object sender, LayoutEventArgs e)
			{
				Assert.Equal (new Rect (0, 0, 20, 10), view._needsDisplayRect);
				view.LayoutStarted -= view_LayoutStarted;
			}

			Application.Begin (top);

			Assert.True (top.IsLoaded);
			Assert.True (subTop.IsLoaded);
			Assert.Equal (new Rect (0, 0, 20, 10), view.Frame);

			view.Frame = new Rect (1, 3, 10, 5);
			Assert.Equal (new Rect (1, 3, 10, 5), view.Frame);
			Assert.Equal (new Rect (0, 0, 10, 5), view._needsDisplayRect);

			view.OnDrawContent (view.Bounds);
			view.Frame = new Rect (1, 3, 10, 5);
			Assert.Equal (new Rect (1, 3, 10, 5), view.Frame);
			Assert.Equal (new Rect (0, 0, 10, 5), view._needsDisplayRect);
		}

		// BUGBUG: Broke this test with #2483 - @bdisp I need your help figuring out why
		[Fact, AutoInitShutdown]
		public void Toplevel_Inside_ScrollView_MouseGrabView ()
		{
			var scrollView = new ScrollView () {
				X = 3,
				Y = 3,
				Width = 40,
				Height = 16,
				ContentSize = new Size (200, 100)
			};
			var win = new Window () { X = 3, Y = 3, Width = Dim.Fill (3), Height = Dim.Fill (3) };
			scrollView.Add (win);
			var top = Application.Top;
			top.Add (scrollView);
			Application.Begin (top);

			Assert.Equal (new Rect (0, 0, 80, 25), top.Frame);
			Assert.Equal (new Rect (3, 3, 40, 16), scrollView.Frame);
			Assert.Equal (new Rect (0, 0, 200, 100), scrollView.Subviews [0].Frame);
			Assert.Equal (new Rect (3, 3, 194, 94), win.Frame);
			TestHelpers.AssertDriverContentsWithFrameAre (@"
                                          ▲
                                          ┬
                                          │
      ┌───────────────────────────────────┴
      │                                   ░
      │                                   ░
      │                                   ░
      │                                   ░
      │                                   ░
      │                                   ░
      │                                   ░
      │                                   ░
      │                                   ░
      │                                   ░
      │                                   ▼
   ◄├──────┤░░░░░░░░░░░░░░░░░░░░░░░░░░░░░► ", output);

			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = 6,
				Y = 6,
				Flags = MouseFlags.Button1Pressed
			}));
			Assert.Equal (win, Application.MouseGrabView);
			Assert.Equal (new Rect (3, 3, 194, 94), win.Frame);

			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = 9,
				Y = 9,
				Flags = MouseFlags.Button1Pressed | MouseFlags.ReportMousePosition
			}));
			Assert.Equal (win, Application.MouseGrabView);
			top.SetNeedsLayout ();
			top.LayoutSubviews ();
			Assert.Equal (new Rect (6, 6, 191, 91), win.Frame);
			Application.Refresh ();
			TestHelpers.AssertDriverContentsWithFrameAre (@"
                                          ▲
                                          ┬
                                          │
                                          ┴
                                          ░
                                          ░
         ┌────────────────────────────────░
         │                                ░
         │                                ░
         │                                ░
         │                                ░
         │                                ░
         │                                ░
         │                                ░
         │                                ▼
   ◄├──────┤░░░░░░░░░░░░░░░░░░░░░░░░░░░░░► ", output);

			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = 5,
				Y = 5,
				Flags = MouseFlags.Button1Pressed | MouseFlags.ReportMousePosition
			}));
			Assert.Equal (win, Application.MouseGrabView);
			top.SetNeedsLayout ();
			top.LayoutSubviews ();
			Assert.Equal (new Rect (2, 2, 195, 95), win.Frame);
			Application.Refresh ();
			TestHelpers.AssertDriverContentsWithFrameAre (@"
                                          ▲
                                          ┬
     ┌────────────────────────────────────│
     │                                    ┴
     │                                    ░
     │                                    ░
     │                                    ░
     │                                    ░
     │                                    ░
     │                                    ░
     │                                    ░
     │                                    ░
     │                                    ░
     │                                    ░
     │                                    ▼
   ◄├──────┤░░░░░░░░░░░░░░░░░░░░░░░░░░░░░► ", output);

			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = 5,
				Y = 5,
				Flags = MouseFlags.Button1Released
			}));
			Assert.Null (Application.MouseGrabView);

			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = 4,
				Y = 4,
				Flags = MouseFlags.ReportMousePosition
			}));
			Assert.Equal (scrollView, Application.MouseGrabView);
		}

		[Fact, AutoInitShutdown]
		public void Dialog_Bounds_Bigger_Than_Driver_Cols_And_Rows_Allow_Drag_Beyond_Left_Right_And_Bottom ()
		{
			var top = Application.Top;
			var dialog = new Dialog (new Button ("Ok")) { Width = 20, Height = 3 };
			Application.Begin (top);
			((FakeDriver)Application.Driver).SetBufferSize (40, 10);
			Application.Begin (dialog);
			Application.Refresh ();
			Assert.Equal (new Rect (0, 0, 40, 10), top.Frame);
			Assert.Equal (new Rect (10, 3, 20, 3), dialog.Frame);
			TestHelpers.AssertDriverContentsWithFrameAre (@$"
          ┌──────────────────┐
          │      {CM.Glyphs.LeftBracket} Ok {CM.Glyphs.RightBracket}      │
          └──────────────────┘
", output);

			Assert.Null (Application.MouseGrabView);

			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = 10,
				Y = 3,
				Flags = MouseFlags.Button1Pressed
			}));

			Assert.Equal (dialog, Application.MouseGrabView);

			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = -11,
				Y = -4,
				Flags = MouseFlags.Button1Pressed | MouseFlags.ReportMousePosition
			}));

			Application.Refresh ();
			Assert.Equal (new Rect (0, 0, 40, 10), top.Frame);
			Assert.Equal (new Rect (0, 0, 20, 3), dialog.Frame);
			TestHelpers.AssertDriverContentsWithFrameAre (@$"
┌──────────────────┐
│      {CM.Glyphs.LeftBracket} Ok {CM.Glyphs.RightBracket}      │
└──────────────────┘
", output);

			// Changes Top size to same size as Dialog more menu and scroll bar
			((FakeDriver)Application.Driver).SetBufferSize (20, 3);
			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = -1,
				Y = -1,
				Flags = MouseFlags.Button1Pressed | MouseFlags.ReportMousePosition
			}));

			Application.Refresh ();
			Assert.Equal (new Rect (0, 0, 20, 3), top.Frame);
			Assert.Equal (new Rect (0, 0, 20, 3), dialog.Frame);
			TestHelpers.AssertDriverContentsWithFrameAre (@$"
┌──────────────────┐
│      {CM.Glyphs.LeftBracket} Ok {CM.Glyphs.RightBracket}      │
└──────────────────┘
", output);

			// Changes Top size smaller than Dialog size
			((FakeDriver)Application.Driver).SetBufferSize (19, 2);
			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = -1,
				Y = -1,
				Flags = MouseFlags.Button1Pressed | MouseFlags.ReportMousePosition
			}));

			Application.Refresh ();
			Assert.Equal (new Rect (0, 0, 19, 2), top.Frame);
			Assert.Equal (new Rect (-1, 0, 20, 3), dialog.Frame);
			TestHelpers.AssertDriverContentsWithFrameAre (@$"
──────────────────┐
      {CM.Glyphs.LeftBracket} Ok {CM.Glyphs.RightBracket}      │
", output);

			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = 18,
				Y = 1,
				Flags = MouseFlags.Button1Pressed | MouseFlags.ReportMousePosition
			}));

			Application.Refresh ();
			Assert.Equal (new Rect (0, 0, 19, 2), top.Frame);
			Assert.Equal (new Rect (18, 1, 20, 3), dialog.Frame);
			TestHelpers.AssertDriverContentsWithFrameAre (@"
                  ┌", output);

			// On a real app we can't go beyond the SuperView bounds
			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = 19,
				Y = 2,
				Flags = MouseFlags.Button1Pressed | MouseFlags.ReportMousePosition
			}));

			Application.Refresh ();
			Assert.Equal (new Rect (0, 0, 19, 2), top.Frame);
			Assert.Equal (new Rect (19, 2, 20, 3), dialog.Frame);
			TestHelpers.AssertDriverContentsWithFrameAre (@"", output);
		}

		[Fact, AutoInitShutdown]
		public void Modal_As_Top_Will_Drag_Cleanly ()
		{
			var dialog = new Dialog () { Width = 30, Height = 10 };
			dialog.Add (new Label (
				"How should I've to react. Cleaning all chunk trails or setting the 'Cols' and 'Rows' to this dialog length?\n" +
				"Cleaning is more easy to fix this.") {
				X = Pos.Center (),
				Y = Pos.Center (),
				Width = Dim.Fill (),
				Height = Dim.Fill (),
				TextAlignment = TextAlignment.Centered,
				VerticalTextAlignment = VerticalTextAlignment.Middle,
				AutoSize = false
			});

			var rs = Application.Begin (dialog);

			Assert.Null (Application.MouseGrabView);
			Assert.Equal (new Rect (25, 7, 30, 10), dialog.Frame);
			TestHelpers.AssertDriverContentsWithFrameAre (@"
                         ┌────────────────────────────┐
                         │ How should I've to react.  │
                         │Cleaning all chunk trails or│
                         │   setting the 'Cols' and   │
                         │   'Rows' to this dialog    │
                         │          length?           │
                         │Cleaning is more easy to fix│
                         │           this.            │
                         │                            │
                         └────────────────────────────┘", output);

			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = 25,
				Y = 7,
				Flags = MouseFlags.Button1Pressed
			}));

			var firstIteration = false;
			Application.RunIteration (ref rs, ref firstIteration);
			Assert.Equal (dialog, Application.MouseGrabView);

			Assert.Equal (new Rect (25, 7, 30, 10), dialog.Frame);
			TestHelpers.AssertDriverContentsWithFrameAre (@"
                         ┌────────────────────────────┐
                         │ How should I've to react.  │
                         │Cleaning all chunk trails or│
                         │   setting the 'Cols' and   │
                         │   'Rows' to this dialog    │
                         │          length?           │
                         │Cleaning is more easy to fix│
                         │           this.            │
                         │                            │
                         └────────────────────────────┘", output);

			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = 20,
				Y = 10,
				Flags = MouseFlags.Button1Pressed | MouseFlags.ReportMousePosition
			}));

			firstIteration = false;
			Application.RunIteration (ref rs, ref firstIteration);
			Assert.Equal (dialog, Application.MouseGrabView);
			Assert.Equal (new Rect (20, 10, 30, 10), dialog.Frame);
			TestHelpers.AssertDriverContentsWithFrameAre (@"
                    ┌────────────────────────────┐
                    │ How should I've to react.  │
                    │Cleaning all chunk trails or│
                    │   setting the 'Cols' and   │
                    │   'Rows' to this dialog    │
                    │          length?           │
                    │Cleaning is more easy to fix│
                    │           this.            │
                    │                            │
                    └────────────────────────────┘", output);

			Application.End (rs);
		}

		// BUGBUG: Broke this test with #2483 - @bdisp I need your help figuring out why
		[Fact, AutoInitShutdown]
		public void Draw_A_Top_Subview_On_A_Dialog ()
		{
			var top = Application.Top;
			var win = new Window ();
			top.Add (win);
			Application.Begin (top);
			((FakeDriver)Application.Driver).SetBufferSize (20, 20);

			Assert.Equal (new Rect (0, 0, 20, 20), win.Frame);
			TestHelpers.AssertDriverContentsWithFrameAre (@"
┌──────────────────┐
│                  │
│                  │
│                  │
│                  │
│                  │
│                  │
│                  │
│                  │
│                  │
│                  │
│                  │
│                  │
│                  │
│                  │
│                  │
│                  │
│                  │
│                  │
└──────────────────┘", output);

			var btnPopup = new Button ("Popup");
			btnPopup.Clicked += (s, e) => {
				var viewToScreen = btnPopup.ViewToScreen (top.Frame);
				var view = new View () {
					X = 1,
					Y = viewToScreen.Y + 1,
					Width = 18,
					Height = 5,
					BorderStyle = LineStyle.Single
				};
				Application.Current.DrawContentComplete += Current_DrawContentComplete;
				top.Add (view);

				void Current_DrawContentComplete (object sender, DrawEventArgs e)
				{
					Assert.Equal (new Rect (1, 14, 18, 5), view.Frame);

					var savedClip = Application.Driver.Clip;
					Application.Driver.Clip = top.Frame;
					view.Draw ();
					top.Move (2, 15);
					View.Driver.AddStr ("One");
					top.Move (2, 16);
					View.Driver.AddStr ("Two");
					top.Move (2, 17);
					View.Driver.AddStr ("Three");
					Application.Driver.Clip = savedClip;

					Application.Current.DrawContentComplete -= Current_DrawContentComplete;
				}
			};
			var dialog = new Dialog (btnPopup) { Width = 15, Height = 10 };
			var rs = Application.Begin (dialog);

			Assert.Equal (new Rect (2, 5, 15, 10), dialog.Frame);
			TestHelpers.AssertDriverContentsWithFrameAre (@$"
┌──────────────────┐
│                  │
│                  │
│                  │
│                  │
│ ┌─────────────┐  │
│ │             │  │
│ │             │  │
│ │             │  │
│ │             │  │
│ │             │  │
│ │             │  │
│ │             │  │
│ │  {CM.Glyphs.LeftBracket} Popup {CM.Glyphs.RightBracket}  │  │
│ └─────────────┘  │
│                  │
│                  │
│                  │
│                  │
└──────────────────┘", output);

			Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent () {
				X = 9,
				Y = 13,
				Flags = MouseFlags.Button1Clicked
			}));

			var firstIteration = false;
			Application.RunIteration (ref rs, ref firstIteration);
			TestHelpers.AssertDriverContentsWithFrameAre (@$"
┌──────────────────┐
│                  │
│                  │
│                  │
│                  │
│ ┌─────────────┐  │
│ │             │  │
│ │             │  │
│ │             │  │
│ │             │  │
│ │             │  │
│ │             │  │
│ │             │  │
│ │  {CM.Glyphs.LeftBracket} Popup {CM.Glyphs.RightBracket}  │  │
│┌────────────────┐│
││One             ││
││Two             ││
││Three           ││
│└────────────────┘│
└──────────────────┘", output);

			Application.End (rs);
		}

		[Fact, AutoInitShutdown]
		public void Activating_MenuBar_By_Alt_Key_Does_Not_Throw ()
		{
			var menu = new MenuBar (new MenuBarItem [] {
				new MenuBarItem ("Child", new MenuItem [] {
					new MenuItem ("_Create Child", "", null)
				})
			});
			var topChild = new Toplevel ();
			topChild.Add (menu);
			Application.Top.Add (topChild);
			Application.Begin (Application.Top);

			var exception = Record.Exception (() => topChild.ProcessHotKey (new KeyEvent (Key.AltMask, new KeyModifiers { Alt = true })));
			Assert.Null (exception);
		}


		[Fact, TestRespondersDisposed]
		public void Multi_Thread_Toplevels ()
		{
			Application.Init (new FakeDriver ());

			var t = Application.Top;
			var w = new Window ();
			t.Add (w);

			int count = 0, count1 = 0, count2 = 0;
			bool log = false, log1 = false, log2 = false;
			bool fromTopStillKnowFirstIsRunning = false;
			bool fromTopStillKnowSecondIsRunning = false;
			bool fromFirstStillKnowSecondIsRunning = false;

			Application.AddTimeout (TimeSpan.FromMilliseconds (100), () => {
				count++;
				if (count1 == 5) {
					log1 = true;
				}
				if (count1 == 14 && count2 == 10 && count == 15) { // count2 is already stopped
					fromTopStillKnowFirstIsRunning = true;
				}
				if (count1 == 7 && count2 == 7 && count == 8) {
					fromTopStillKnowSecondIsRunning = true;
				}
				if (count == 30) {
					Assert.Equal (30, count);
					Assert.Equal (20, count1);
					Assert.Equal (10, count2);

					Assert.True (log);
					Assert.True (log1);
					Assert.True (log2);

					Assert.True (fromTopStillKnowFirstIsRunning);
					Assert.True (fromTopStillKnowSecondIsRunning);
					Assert.True (fromFirstStillKnowSecondIsRunning);

					Application.RequestStop ();
					return false;
				}
				return true;
			});

			t.Ready += FirstDialogToplevel;

			void FirstDialogToplevel (object sender, EventArgs args)
			{
				var od = new OpenDialog ();
				od.Ready += SecondDialogToplevel;

				Application.AddTimeout (TimeSpan.FromMilliseconds (100), () => {
					count1++;
					if (count2 == 5) {
						log2 = true;
					}
					if (count2 == 4 && count1 == 5 && count == 5) {
						fromFirstStillKnowSecondIsRunning = true;
					}
					if (count1 == 20) {
						Assert.Equal (20, count1);
						Application.RequestStop ();
						return false;
					}
					return true;
				});

				Application.Run (od);
			}

			void SecondDialogToplevel (object sender, EventArgs args)
			{
				var d = new Dialog ();

				Application.AddTimeout (TimeSpan.FromMilliseconds (100), () => {
					count2++;
					if (count < 30) {
						log = true;
					}
					if (count2 == 10) {
						Assert.Equal (10, count2);
						Application.RequestStop ();
						return false;
					}
					return true;
				});

				Application.Run (d);
			}

			Application.Run ();
			Application.Shutdown ();
		}
	}
}